Blue growth rings in woody plant stems indicate years when cells failed to lignify properly due to summers that were too cold ...

Trees need a certain number of warm days in their growing seasons to grow properly; otherwise, the cell walls of new growth ...

Volcanic eruptions and cold summers leave lasting marks in the wood of northern trees, unlocking the secrets of past climate extremes.

It's not hard to find a high-quality, affordable engagement ring if you know where to look. Here's where our editors ...

The team cross-sectioned and stained these samples, then photographed them under a microscope so that growth ring widths could be measured and cross-dated, and blue rings identified.

In order to grow properly, trees need an adequate period of warmth during their growing seasons; otherwise, the cell walls [… ...

Taken from a tree in Norway, this stained tree sample shows a blue ring from 1902. (Credit: Pawel Matulewski and Liliana Siekacz) Human skin isn't the only thing that can change color after facing the ...

The team cross-sectioned and stained these samples, then photographed them under a microscope so that growth ring widths could be measured and cross-dated, and blue rings identified. “Blue ring ...

Blue rings found in the stems of trees and bushes in Norway point ... related cooling in northern Norway after this eruption,” scientists say. “This blue ring could also be due to another, ...